Resolve #3202820 "508 issues lost"

Closes #3202820

js/modal-page.js

@@ -51,6 +51,25 @@
           auto_open = modal.data("auto-open");
         }
 
+
+        modal.on('shown.bs.modal', function() {
+          $(this).find(".js-modal-page-ok-buttom").first().focus();
+        });
+
+        modal.on('keydown', function(e) {
+          var keyCode = e.keyCode || e.which;
+          var lastElement = $(this).find('.js-modal-page-ok-buttom').last().is(':focus');
+          var firstElement = $(this).find(".js-modal-page-ok-buttom").first().is(':focus');
+
+          if (keyCode === 9 && !e.shiftKey && lastElement) {
+            e.preventDefault();
+            $(this).find(".js-modal-page-ok-buttom").first().focus();
+          } else if(keyCode === 9 && e.shiftKey && firstElement) {
+            e.preventDefault();
+            $(this).find(".js-modal-page-ok-buttom").last().focus();
+          }
+        });
+
         // Open Modal on Auto Open.
         if (auto_open == true) {